Table 1.
Sequence 1 | Sequence 2 | |
---|---|---|
Parallel Imaging? | no | yes |
Type of parallel imaging [acceleration factor] | n/a | ARC (25) [R=3.56] |
main purpose | dynamic phase & time course imaging | flip angle optimization high resolution imaging |
parameters to evaluate | SNR, CNR | CNRrel relative contrast-to-noise |
sequence type | 3D SPGR (LAVA) | 3D SPGR (LAVA) |
fat saturation | periodic spectrally-selective partial inversion | periodic spectrally-selective partial inversion |
excitation | axial slab excitation | axial slab excitation |
FA | 15° | 5° steps from 10°–45° |
TR | 4.1 ms | 5.4–5.5 ms |
TE | 1.8 ms | 2.1 ms |
matrix | 256 × 192 | 288 × 224 |
FOV | 400 × 320 | 400 × 320 |
BW | ±62.5 kHz | ±62.5 kHz |
slices | 80 | 192 |
slice thickness | 5 mm | 2 mm |
true spatial resolution | 1.6 × 2.1 × 5 mm3 | 1.4 × 1.8 × 2.0 mm3 |
interpolated spatial resolution | 0.8 × 0.8 × 2.5 mm3 | 0.8 × 0.8 × 1.0 mm3 |